A consumer organization wants to know whether there is a difference in the mean price of a particular toy at three different types of stores. The price of the toy is to be checked in independent samples of five discount stores, five variety stores, and five department stores. Let and be the population mean prices for the toy at the discount, variety, and department stores, respectively. We shall assume that the prices of the toy for each type of store are normally distributed.
Identify (a) the response variable, (b) the factor, (c) the treatments, and (d) the experimental units.